fix(misc): allow run-commands to accept readyWhen for a single command

[leosvelperez]

Current Behavior

@nrwl/workspace:run-commands does not allow to use readyWhen with a single command. This was something that was kind of working before #6448, because we were able to bypass the restriction by using commands with a single command, but if you tried to use it with command it would error. This was inconsistent behavior and not in line with the docs. In #6448 the restriction was "corrected" to match the docs, but there's actually no reason to enforce that and limit that option to only multiple commands.

Expected Behavior

@nrwl/workspace:run-commands should allow using readyWhen with a single command. When running multiple commands, readyWhen can only be set if the parallel option is set to true.

Related Issue(s)

Fixes #

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Status	Command
	nx affected --target=build --base=59fa59fddc4b05df40b076f5beb412df288f3af5 --parallel --max-parallel=3
	nx affected --target=e2e --base=59fa59fddc4b05df40b076f5beb412df288f3af5
	nx affected --target=lint --base=59fa59fddc4b05df40b076f5beb412df288f3af5 --parallel --max-parallel=4
	nx affected --target=test --base=59fa59fddc4b05df40b076f5beb412df288f3af5 --parallel --max-parallel=2
	nx build typedoc-theme

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